CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 264,798	$ 305,032
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	256,746	225,695
Amortization of deferred financing costs	2,144	1,918
Amortization of discounts and premiums on debt	1,311	1,267
Amortization of deferred settlements on derivative instruments	683	608
Amortization of right-of-use assets	3,189	3,231
Write-off of pursuit costs	1,321	548
(Income) loss from investments in unconsolidated entities	6,411	1,698
Distributions from unconsolidated entities – return on capital	150	159
Net (gain) loss on sales of real estate properties	(154,152)	(188,185)
Net (gain) loss on sales of land parcels	67
Realized (gain) loss on investment securities	40
Unrealized (gain) loss on investment securities		(7,061)
Compensation paid with Company Common Shares	10,370	9,469
Changes in assets and liabilities:
(Increase) decrease in other assets	25,405	22,737
Increase (decrease) in accounts payable and accrued expenses	51,306	54,289
Increase (decrease) in accrued interest payable	(23,860)	(16,526)
Increase (decrease) in lease liabilities	(541)	(499)
Increase (decrease) in other liabilities	(21,564)	7,011
Increase (decrease) in security deposits	1,701	(360)
Net cash provided by operating activities	425,525	421,031
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions		(837)
Investment in real estate – development/other	(30,971)	(25,491)
Capital expenditures to real estate	(61,950)	(73,520)
Non-real estate capital additions	(935)	(534)
Interest capitalized for real estate and unconsolidated entities under development	(3,922)	(3,150)
Proceeds from disposition of real estate, net	226,749	247,334
Investments in unconsolidated entities - development/other	(32,320)	(7,812)
Distributions from unconsolidated entities – return of capital	331	16
Proceeds from sale of investment securities	359
Net cash provided by (used for) investing activities	97,341	136,006
Mortgage notes payable, net:
Lump sum payoffs	(37,940)
Line of credit and commercial paper:
Commercial paper proceeds	11,238,316	1,186,790
Commercial paper repayments	(11,477,995)	(1,370,000)
Finance ground lease principal payments	(735)	(719)
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	942	1,644
Proceeds from exercise of EQR options	4,360	4,401
Redemption of Preference Units		(20,125)
Premium on redemption of Preference Units		(1,444)
Other financing activities, net	(7)	(7)
Contributions – Noncontrolling Interests – Partially Owned Properties		235
Contributions – Limited Partners	4	2
Distributions:
OP Units – General Partner	(256,401)	(251,334)
Preference Units	(356)	(964)
OP Units – Limited Partners	(8,309)	(8,154)
Noncontrolling Interests – Partially Owned Properties	(3,368)	(2,323)
Net cash provided by (used for) financing activities	(541,489)	(500,472)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(18,623)	56,565
Cash and cash equivalents and restricted deposits, beginning of period	160,166	139,995
Cash and cash equivalents and restricted deposits, end of period	141,543	196,560
Cash and cash equivalents	39,849	44,535
Restricted deposits	101,694	152,025
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	89,541	77,149
Net cash paid (received) for income and other taxes	371	410
Amortization of deferred financing costs:
Other assets	697	696
Mortgage notes payable, net	355	262
Notes, net	1,092	960
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	698	706
Notes, net	613	561
Amortization of deferred settlements on derivative instruments:
Other liabilities	(3)	(2)
Accumulated other comprehensive income	686	610
Write-off of pursuit costs:
Investment in real estate, net	82	128
Investments in unconsolidated entities	1,151	355
Other assets	88	65
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	6,104	1,390
Other liabilities	307	308
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(555)
Other liabilities	2,059
Accumulated other comprehensive income	(1,504)	0
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	2,404	1,159
Investments in unconsolidated entities	(1,518)	(1,991)
Investments in unconsolidated entities - development/other:
Investments in unconsolidated entities	(31,660)	(7,152)
Other liabilities	(660)	(660)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(527)
Lease liabilities	527
Non-cash change in Supplemental Executive Retirement Plan (SERP) balances:
Other assets	16,213	4,561
Other liabilities	16,324	4,334
Paid in capital	111	(227)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	264,798	305,032
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	256,746	225,695
Amortization of deferred financing costs	2,144	1,918
Amortization of discounts and premiums on debt	1,311	1,267
Amortization of deferred settlements on derivative instruments	683	608
Amortization of right-of-use assets	3,189	3,231
Write-off of pursuit costs	1,321	548
(Income) loss from investments in unconsolidated entities	6,411	1,698
Distributions from unconsolidated entities – return on capital	150	159
Net (gain) loss on sales of real estate properties	(154,152)	(188,185)
Net (gain) loss on sales of land parcels	67
Realized (gain) loss on investment securities	40
Unrealized (gain) loss on investment securities		(7,061)
Compensation paid with Company Common Shares	10,370	9,469
Changes in assets and liabilities:
(Increase) decrease in other assets	25,405	22,737
Increase (decrease) in accounts payable and accrued expenses	51,306	54,289
Increase (decrease) in accrued interest payable	(23,860)	(16,526)
Increase (decrease) in lease liabilities	(541)	(499)
Increase (decrease) in other liabilities	(21,564)	7,011
Increase (decrease) in security deposits	1,701	(360)
Net cash provided by operating activities	425,525	421,031
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions		(837)
Investment in real estate – development/other	(30,971)	(25,491)
Capital expenditures to real estate	(61,950)	(73,520)
Non-real estate capital additions	(935)	(534)
Interest capitalized for real estate and unconsolidated entities under development	(3,922)	(3,150)
Proceeds from disposition of real estate, net	226,749	247,334
Investments in unconsolidated entities - development/other	(32,320)	(7,812)
Distributions from unconsolidated entities – return of capital	331	16
Proceeds from sale of investment securities	359
Net cash provided by (used for) investing activities	97,341	136,006
Mortgage notes payable, net:
Lump sum payoffs	(37,940)
Line of credit and commercial paper:
Commercial paper proceeds	11,238,316	1,186,790
Commercial paper repayments	(11,477,995)	(1,370,000)
Finance ground lease principal payments	(735)	(719)
Proceeds from EQR's Employee Share Purchase Plan (ESPP)	942	1,644
Proceeds from exercise of EQR options	4,360	4,401
OP Units repurchased and retired		(38,474)
Redemption of Preference Units		(20,125)
Premium on redemption of Preference Units		(1,444)
Other financing activities, net	(7)	(7)
Contributions – Noncontrolling Interests – Partially Owned Properties		235
Contributions – Limited Partners	4	2
Distributions:
OP Units – General Partner	(256,401)	(251,334)
Preference Units	(356)	(964)
OP Units – Limited Partners	(8,309)	(8,154)
Noncontrolling Interests – Partially Owned Properties	(3,368)	(2,323)
Net cash provided by (used for) financing activities	(541,489)	(500,472)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(18,623)	56,565
Cash and cash equivalents and restricted deposits, beginning of period	160,166	139,995
Cash and cash equivalents and restricted deposits, end of period	141,543	196,560
Cash and cash equivalents	39,849	44,535
Restricted deposits	101,694	152,025
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	89,541	77,149
Net cash paid (received) for income and other taxes	371	410
Amortization of deferred financing costs:
Other assets	697	696
Mortgage notes payable, net	355	262
Notes, net	1,092	960
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	698	706
Notes, net	613	561
Amortization of deferred settlements on derivative instruments:
Other liabilities	(3)	(2)
Accumulated other comprehensive income	686	610
Write-off of pursuit costs:
Investment in real estate, net	82	128
Investments in unconsolidated entities	1,151	355
Other assets	88	65
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	6,104	1,390
Other liabilities	307	308
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(555)
Other liabilities	2,059
Accumulated other comprehensive income	(1,504)
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(2,404)	(1,159)
Investments in unconsolidated entities	(1,518)	(1,991)
Investments in unconsolidated entities - development/other:
Investments in unconsolidated entities	(31,660)	(7,152)
Other liabilities	(660)	(660)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(527)
Lease liabilities	527
Non-cash change in Supplemental Executive Retirement Plan (SERP) balances:
Other assets	16,213	4,561
Other liabilities	(16,324)	(4,334)
Paid in capital	$ 111	$ (227)